| article html file updated | 7 February 2020 02:17 CET | Update | https://www.mdpi.com/2221-3759/3/4/158 |
| article html file updated | 6 May 2019 04:52 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:34 CET | Original file | N/A |
| article pdf uploaded. | 16 December 2015 15:09 CET | Version of Record | https://www.mdpi.com/2221-3759/3/4/158/pdf |
